2.1.906 Part 1 Section 18.17.7.56, COUNTIFS
a. The standard specifies a count-range argument.
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Office does not accept a count-range argument.
b. The standard specifies that selection-criteria-1 is the first range of cells to be counted.
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Office specifies that selection-criteria-1 is in the form of a number, expression, cell reference, or text that define which cells will be counted.